Maoyuu Maou Yuusha: 'Kono Ware no Mono to Nare, Yuusha yo' 'Kotowaru!'

After enduring a long and perilous journey, the Hero finally breaches the fortress of the Demon Queen, fully prepared for a decisive battle. Instead of a fight, he is met with an unexpected plea for his assistance. Outraged, the Hero confronts her, detailing the immense suffering the demonic invasion has inflicted upon humanity—thousands slaughtered and countless others plunged into despair. However, the Demon Queen calmly counters his accusations by presenting undeniable empirical evidence that challenges everything he believes about the conflict. She reveals that the war has inadvertently unified fractured human societies against a common enemy. According to her data, this unity has driven unprecedented population growth, boosted agricultural production, stimulated the economy, and elevated human civilization as a whole. More alarmingly, she warns that abruptly ending the war would not bring peace; rather, it would ignite a devastating internal civil war among humans, resulting in far greater bloodshed than the current conflict ever caused. Faced with this grim reality, the Hero realizes that simply slaying the Demon Queen will only lead to further ruin. Convinced that true stability requires an unconventional approach, he agrees to join forces with his former enemy, dedicating himself to executing her intricate plans for lasting peace.